A question had appeared in a student's medical examination which read: "List four benefits of breast milk." A student began to answer the question: 1. No need to bottle it. 2. Cats can't steal it. 3. Available whenever necessary. But the fourth point eluded him. When there were barely a couple of minutes before the exam ended, the fourth point flashed before his mind. So he completed the answer by writing: 4. Available in attractive containers.